Electric-arc lamp.



Patented 001;.31, 1911.

2 BHBETB-BHBET 1.

M. KRTING. ELEGTRIO ABU LAMP.

APPLICATION FILED NOV. B2, 190D.

d? A A A A A A A A A A A H X V I V I V Y 1 Y V I M. KRUNG.

ELECTRIC ARC LAMP.

APPLICATION FILED NOV. 22,1909.

1 1,007,211. Patented 001.31, 1911.

2 BHEETS-SHEBT 2.

UNITED STATES PAgENT oEEicE.

MAX KRTTNG, F LEUTZSCH, NEAR LEIPZIG, GERMANY, ABSIGNOB T0 KRTING cMATHIEBEN AKTIENGESELLSCHAFT, 0F LEUTZSCB, NEAR LEIPZIG,' GERMANY.

nnnc'rnlcnnc LAMP.,

Bpecilcation of Letters Patent.

Patented Oct. 31, 1911.

Application led November 22, 190B. Serial No. 529,440.

l To all whom it may concern:

Be it known that I, MAX Kn'rlNo, a subject of the German Emperor,residing at Leutzsch, near Leipzig, (rermany, have invented a new anduseful Electric-Arc Lamp, of which the following is a s ecification.

This invention relates to e ectric arc lamps supplied with analternating currentrandlts object is to provide improved means Wherebyon any lamp being extinguished a compensating impedance shall beswitched into the circuit so that the remaining lamps may be una'ected.

Figure 1 of the accompanying drawings shows diagrammatically, one formof lamp made in accordance with this invention while Fig. 2 shows amodified form and Fig. 3 shows another method of carrying out theinvention.

1. 2 are the terminals of the main conductor between which is inserted adiiferential arc lamp the carbons of which are shown at 3, i

5 is the winding of the usual series magnet which tends to raise thecarbon 3, and 6 t `t of the usual shunt magnet which tenus to lower thecarbon 3. Another shunt circuit includes the exciting winding 7 of aswitching device and the secondary 8 of a transformer coil, the primary9 of which acting as a choke coil is inserted in yet another shuntcircuit, which can be completed and interrupted by the switch itselfshown at 10. The circuit of the choke coil is adapted to cause exactlythe same fall of potential as does the lamp when alight.

The diagram shows the parts in the position occupled when the lamp isalight with no current flowing through the choke coil 9 but with a smallcurrent, i. e. one insufficient to move the switch, flowing through theexciting winding 7 and the secondary 8. Should however the carbon feedbecome deranged or either of the carbons nearly consumed, then thecurrent in theexciting winding 7 will increase sufficiently to move theswitch 10 so that the circuit of the choke coil 9 Vwill be completed,current will flow through this choke coil and the induced current in thesecondary 8 owing through the exciting winding 7 will retain the switchin the required position. It will be seen that this arrangementovercomes the difficulty experienced with this class of apparatus thatunless a main current winding is provided if the compensatin resistanceis to produce exactly the same all of potential on the main circuit asdoes the lamp when alight then when such resistance has been switchedinto circuit in lieu of a lamp, the current in the exciting winding ofthe switching device resumes its normal state and the switch isaccordingly no longer held.

In the modification shown in Fi 2 the winding 6 of the shunt magnet of te lamp acts also as the exciting winding of the switching device. Asbefore the winding 5 when excited tends to raise the carbon 3 throughits solenoid While the winding 6 when excited tends to lower the carbon3 through its solenoid. When anything goes wrong with the lamp, morecurrent than is usual in the normal working of the lamp will fiowthrough the winding .6 which becoming hi hly excited draws down itsarmature fart er than can occur with the normal working of the lamp andcauses the switch to close the primary or choke coil circuit.

In place of increasing the voltage of the current in the excitingwinding of the switching device by a transformer coil, this may beeffected by cutting a resistance out ofthe circuit of such excitingwindin as soon as the compensating resistance has een switched in, thiscutting out being accomplished by the movement of the switch itself.`This' modification is shown in Fig. 3 in which 1, 2 are the terminals ofthe main conductor between which is inserted a differential are lamp thecarbons of which are shown at 3, 4. 5 is the winding of the usual seriesmagnet which tends to raise the carbon 3 and 6 that of the usual shuntmagnet which tends to lower the carbon 3 and also to operate switchcontacts V10, 1l, 12, 13. 9 is a choke coil or ohmic resistance situatedin a shunt circuit and adapted to cause when switched in exactly thesame fall of potential as does the lamp when alight; one terminal of thecoil 9 is connected to the switch terminal l0 and through the otherswitch terminal ll to the lamp terminal 2. 8 is a resistance oneterminal of which is connected to the switchterminal l2, the resistanceS being in a circuit which normally includes the winding 6; the4 otherswitch terminal 13 is connected to the line leading to the resistance 8.When the lamp is burning normally current flows through the-resistance 8and thence through the winding 6 ment of'a main current windin winding 6which there ore as in the preceding eases has passing through it acurrent of higher voltage than when the lamp was alight and theswitching device will be held fast when the resistance `9 causes exactlythe same fall of potential as does the lamp when alight and this withoutthe employ- It will be obvious that any garni of magnetic switchingdevice comprising an ex* citing winding may be employed.

What I claim is 1. In an alternating current arc lamp, the combinationwith a main circuit, of a switch having a shunt exciting winding, atransformer havin a primar adapted to be switched in said circuit w enthe switch is o erated and adapted to cause practically t e same fall ofotential in the main circuit as does the amp when alight2 and asecondary of said transformer in serles with the said excited winding.

2. In an alternating current are lamp, the

combination with a main circuit, of a shunt lamp r latmg magnet having ashunt exciting wlnding continuously excitedla switch aving a tcontrolled thereby, a transformer primary adapted to be switched in saidcircuit when the switch is operated and adapt-Y ed to cause practicallythe same fall of potential in the main circuit as does the lamp whenalight, and a seconder of the transformer in series with the saiexciting winding.

a set of electrodes and a circuit therefor of an impedance adapted toreplace said e ectrodes, an electro-magnetic switch for con- MAX KRTING.

Witnesses: i l i CARL SPmNesrnLo, RUnonrn Fmcxn.

3. In an arc lamp, the combination with i lamp, the combination with-

